Examine source code of H5EQ

{
  "manifest_version": 2,
  "name": "H5EQ",
  "version": "0.0.2",
  "author": "Tyler Snedigar <snedigart@gmail.com>",
  "homepage_url": "https://github.com/pulse0ne/H5EQ",
  "description": "HTML5 equalization",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/icon-48.png",
    "default_title": "H5EQ",
    "default_popup": "popup/popup.html",
    "browser_style": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "lib/webextension-polyfill/browser-polyfill.js",
        "content_scripts/h5eq.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "lib/webextension-polyfill/browser-polyfill.js",
      "background_scripts/background.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html"
  }
}